CVE-2022-39823Network attack vector

Server crash via excessive browse continuation points

Published Oct 20, 2022 · Updated May 8, 2025

Use-after-free in Softing OPC UA C++ SDK 5.70 through 6.00 and OPC Suite 5.20 through 5.22 allows remote attackers to crash servers. When a browse request exceeds the server's continuation-point limit, the server accesses an object after freeing it and terminates. An established OPC UA session is required, and anonymous sessions leave the process remotely crashable; service returns only after restart.

CVSS severity7.5
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Softing OPC UA C++ SDK 5.70 through 6.00 and OPC Suite 5.20 through 5.22 allows remote attackers to crash servers. When a browse request exceeds the server's continuation-point limit, the server accesses an object after freeing it and terminates. An established OPC UA session is required, and anonymous sessions leave the process remotely crashable; service returns only after restart.

The record

CVE
CVE-2022-39823
Published
Oct 20, 2022
Updated
May 8, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 20, 2022CVE publishedPublication date reported by the CVE source.
  2. May 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5Softing Industrial Automation GmbHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T0814Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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